Cat litter box



FIG. 1 is a top and front perspective view of a cat litter box, showing my new design;

FIG. 2 is a bottom and front perspective view thereof;

FIG. 3 is a side elevational view thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a front elevational view thereof; and

FIG. 7 is a bottom plan view thereof. 

The ornamental design for a cat litter box, substantially as shown. 